Since the original aesthetic tweaks came about, Kelleners hasn’t made any changes to the exterior appearance. They did release a more comprehensive image gallery of their new star.

In the meantime, they’ve been rather busy working on what’s going on behind the scenes. That’s my kind of work if I’m honest.

The newly added 20 inch alloy wheel options may not be the best thing to ever happen when talking about a newly tweaked car dynamically, but there’s no doubt that the’ll add some appeal to the final product.

Cruisers will love those, the rest of us driving oriented folk will stick to the 19 inch ones and have a look at what can Kelleners do with your engine power output.

Thanks to simple piggy back ECU kits and exhaust updates here’s what you can have. The 320d diesel version can go from 184 to a much more meaty 218 horsepower.

Then there’s the 328i version. While it produces 245 horsepower as standard and it feels great, the Kelleners Sport offered 294 horses do sound somewhat better.

Finally, the current gem of the BMW 3 Series lineup, the 335i goes from a standard 306 hp to an M division taste of 367 ponies.

All models come with proportional increase in torque figures and hardly noticeable fuel consumption changes. Let’s not forget the Germans are still obsessed with efficiency.

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There’s plenty with more performance and there’s plenty with more aggressive body kits but the AC Schnitzer ACS 99d is miles more impressive.

This is because it gets a new (and unexpected) engine and it also loses a whopping 507 pounds off what is already a decently lightweight vehicle.

The first part is taken care of as AC Schnitzer have dropped the engine originally fitted by the factory and opted for the one you get in the 320d EfficientDynamics Edition.

Well known as an incredibly efficient powerplant, AC Schnitzer have taken it one point further and while they were at it they made it a little more powerful as it now develops 190 horsepower.

Team that up with a new body kit that’s made completely out of carbon fiber, the reduction of unsprung weight and the fitting of 19″ lightweight alloy wheels with titanium bolts and you get a lot of benefits.

Lighter weight, better distribution of what’s left and even better fuel economy levels. It is also part of helping the handling.

That’s where the revised AC Schnitzer suspension, new brakes and Continental Sport Contact high performance tires help finish the thing off.

The end result is that the AC Schnitzer ACS 99d is a sports car which goes from 0 to 62 in 6.9 seconds yet only consumes 3.8 l of fuel per 100 km and emits less than 99 g of CO2 per km.

This is the sort of efficiency that is impressive even in horrid little eco-boxes let alone great handling and fun sport cars.

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